Security · x402 · early usage

Check an x402 niche before you build or buy

by audit.152-53-82-29.sslip.io · discovered, not yet claimed by its owner · updated 2026-09-28

30d calls2

30d payers2

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Check an x402 niche before you build or buy. Send {"query":"pdf to markdown"}. Returns matching bazaar listings and hosts, how many have outside paying buyers in the last 30 days, max and median unique payers, price quartiles overall and among listings with demand, top listings and hosts by payers, and a verdict: empty, no-demand, thin-supply, contested, or incumbent-dominated. From Coinbase discovery metrics, refreshed every 6 hours.

Tags: x402-bazaar · market-research · competition · pricing · demand · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-09-28

Input example from Bazaar metadata

{
  "limit": 10,
  "query": "pdf to markdown"
}

Output example

{
  "bazaar_listings": 16604,
  "data_as_of": "2026-09-23T22:00:00Z",
  "demand": {
    "calls_30d": 552,
    "listings_with_outside_payers": 6,
    "max_unique_payers_30d": 8,
    "median_unique_payers_30d_among_demand": 4,
    "share_with_outside_payers": 0.24
  },
  "match_mode": "all-words",
  "notes": [
    "Every indexed listing has at least one payment (the indexing call). Demand here means 2 or more unique payers."
  ],
  "price_usd": {
    "all": {
      "max": 0.1,
      "median": 0.01,
      "min": 0.001,
      "n": 25,
      "p25": 0.005,
      "p75": 0.02
    },
    "with_demand": {
      "max": 0.02,
      "median": 0.01,
      "min": 0.005,
      "n": 6,
      "p25": 0.005,
      "p75": 0.01
    }
  },
  "query": "pdf to markdown",
  "supply": {
    "called_last_7d": 12,
    "hosts": 19,
    "listings": 25
  },
  "top_hosts": [
    {
      "calls_30d": 45,
      "host": "netintel.dev",
      "listings": 2,
      "listings_with_demand": 1,
      "max_unique_payers_30d": 8
    }
  ],
  "top_listings": [
    {
      "calls_30d": 41,
      "description": "Convert a PDF URL to clean markdown",
      "host": "netintel.dev",
      "last_called_at": "2026-09-23T15:00:00Z",
      "networks": [
        "eip155:8453"
      ],
      "price_usd": 0.01,
      "resource": "https://netintel.dev/api/pdf-to-markdown",
      "unique_payers_30d": 8
    }
  ],
  "verdict": {
    "label": "contested",
    "reason": "19 hosts sell this, and 6 of 25 listings have outside payers. Compete on price, schema quality, or a narrower angle."
  }
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/37945.json for the price and payment options.
Pay. Call GET https://audit.152-53-82-29.sslip.io/v1/niche. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Polygon, Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, Solana
Demand: 2 calls · 2 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.01	0x9Ea52806dB0b25a8130D2b210D5336eC1DCFBa0e	300s
exact	Polygon eip155:137	USDC	$0.01	0x9Ea52806dB0b25a8130D2b210D5336eC1DCFBa0e	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.01	EtmTq4WoUyKvh5aPpB4xXNDRQDQmPSYBzLGLKJprZHHd	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x9Ea52806dB0b25a8130D2b210D5336eC1DCFBa0e",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x9Ea52806dB0b25a8130D2b210D5336eC1DCFBa0e",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "EtmTq4WoUyKvh5aPpB4xXNDRQDQmPSYBzLGLKJprZHHd",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "bazaar_listings": {
          "type": "integer"
        },
        "data_as_of": {
          "type": "string"
        },
        "demand": {
          "properties": {
            "calls_30d": {
              "type": "integer"
            },
            "listings_with_outside_payers": {
              "type": "integer"
            },
            "max_unique_payers_30d": {
              "type": "integer"
            },
            "median_unique_payers_30d_among_demand": {
              "type": "integer"
            },
            "share_with_outside_payers": {
              "type": "number"
            }
          },
          "type": "object"
        },
        "match_mode": {
          "enum": [
            "all-words",
            "most-words",
            "ranked"
          ],
          "type": "string"
        },
        "match_score": {
          "description": "Ranked mode only: closeness score of the best listing",
          "type": "number"
        },
        "notes": {
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "price_usd": {
          "properties": {
            "all": {
              "properties": {
                "max": {
                  "type": "number"
                },
                "median": {
                  "type": "number"
                },
                "min": {
                  "type": "number"
                },
                "n": {
                  "type": "integer"
                },
                "p25": {
                  "type": "number"
                },
                "p75": {
                  "type": "number"
                }
              },
              "type": [
                "object",
                "null"
              ]
            },
            "with_demand": {
              "properties": {
                "max": {
                  "type": "number"
                },
                "median": {
                  "type": "number"
                },
                "min": {
                  "type": "number"
                },
                "n": {
                  "type": "integer"
                },
                "p25": {
                  "type": "number"
                },
                "p75": {
                  "type": "number"
                }
              },
              "type": [
                "object",
                "null"
              ]
            }
          },
          "type": "object"
        },
        "query": {
          "type": "string"
        },
        "suggested_query": {
          "description": "Ranked mode with a match only: keywords the market was sized on",
          "type": "string"
        },
        "supply": {
          "properties": {
            "called_last_7d": {
              "type": "integer"
            },
            "hosts": {
              "type": "integer"
            },
            "listings": {
              "type": "integer"
            }
          },
          "type": "object"
        },
        "top_hosts": {
          "items": {
            "properties": {
              "calls_30d": {
                "type": "integer"
              },
              "host": {
                "type": "string"
              },
              "listings": {
                "type": "integer"
              },
              "listings_with_demand": {
                "type": "integer"
              },
              "max_unique_payers_30d": {
                "type": "integer"
              }
            },
            "type": "object"
          },
          "type": "array"
        },
        "top_listings": {
          "items": {
            "properties": {
              "calls_30d": {
                "type": "integer"
              },
              "description": {
                "type": "string"
              },
              "host": {
                "type": "string"
              },
              "last_called_at": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "networks": {
                "items": {
                  "type": "string"
                },
                "type": "array"
              },
              "price_usd": {
                "type": [
                  "number",
                  "null"
                ]
              },
              "resource": {
                "type": "string"
              },
              "unique_payers_30d": {
                "type": "integer"
              }
            },
            "type": "object"
          },
          "type": "array"
        },
        "verdict": {
          "properties": {
            "label": {
              "enum": [
                "empty",
                "no-demand",
                "thin-supply",
                "contested",
                "incumbent-dominated"
              ],
              "type": "string"
            },
            "reason": {
              "type": "string"
            }
          },
          "type": "object"
        }
      },
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "bazaar_listings": 0,
    "data_as_of": "string",
    "demand": {
      "calls_30d": 0,
      "listings_with_outside_payers": 0,
      "max_unique_payers_30d": 0,
      "median_unique_payers_30d_among_demand": 0,
      "share_with_outside_payers": 0
    },
    "match_mode": "all-words",
    "match_score": 0,
    "notes": [
      "string"
    ],
    "price_usd": {
      "all": {
        "max": 0,
        "median": 0,
        "min": 0,
        "n": 0,
        "p25": 0,
        "p75": 0
      },
      "with_demand": {
        "max": 0,
        "median": 0,
        "min": 0,
        "n": 0,
        "p25": 0,
        "p75": 0
      }
    },
    "query": "string",
    "suggested_query": "string",
    "supply": {
      "called_last_7d": 0,
      "hosts": 0,
      "listings": 0
    },
    "top_hosts": [
      {
        "calls_30d": 0,
        "host": "string",
        "listings": 0,
        "listings_with_demand": 0,
        "max_unique_payers_30d": 0
      }
    ],
    "top_listings": [
      {
        "calls_30d": 0,
        "description": "string",
        "host": "string",
        "last_called_at": "string",
        "networks": [
          "string"
        ],
        "price_usd": 0,
        "resource": "string",
        "unique_payers_30d": 0
      }
    ],
    "verdict": {
      "label": "empty",
      "reason": "string"
    }
  },
  "type": "string"
}

Examples

curl

curl "https://audit.152-53-82-29.sslip.io/v1/niche"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://audit.152-53-82-29.sslip.io/v1/niche");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://audit.152-53-82-29.sslip.io/v1/niche")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: audit.152-53-82-29.sslip.io
Endpoint: https://audit.152-53-82-29.sslip.io/v1/niche
Machine-readable: /resources/37945.json